fix(v3): modal dark-themed directory picker via custom rfd command

v2/Cargo.lock

@@ -297,6 +297,7 @@ dependencies = [
  "futures-util",
  "log",
  "notify",
+ "rfd",
  "rusqlite",
  "serde",
  "serde_json",

v2/src-tauri/Cargo.toml

@@ -28,6 +28,7 @@ dirs = "5"
 notify = { version = "6", features = ["macos_fsevent"] }
 tauri-plugin-updater = "2.10.0"
 tauri-plugin-dialog = "2"
+rfd = { version = "0.16", default-features = false, features = ["gtk3"] }
 uuid = { version = "1", features = ["v4"] }
 tokio-tungstenite = { version = "0.21", features = ["native-tls"] }
 tokio = { version = "1", features = ["full"] }

v2/src-tauri/src/lib.rs

@@ -421,7 +421,15 @@ fn project_agent_state_load(
     state.session_db.load_project_agent_state(&project_id)
 }
 
-// Directory picker: uses tauri-plugin-dialog (frontend API: @tauri-apps/plugin-dialog)
+// Directory picker: custom rfd command with parent window for modal behavior on Linux
+#[tauri::command]
+async fn pick_directory(window: tauri::Window) -> Result<Option<String>, String> {
+    let dialog = rfd::AsyncFileDialog::new()
+        .set_title("Select Directory")
+        .set_parent(&window);
+    let folder = dialog.pick_folder().await;
+    Ok(folder.map(|f| f.path().to_string_lossy().into_owned()))
+}
 
 // --- CLI argument commands ---
 
@@ -501,6 +509,9 @@ async fn remote_pty_kill(state: State<'_, AppState>, machine_id: String, id: Str
 
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
+    // Force dark GTK theme for native dialogs (file chooser, etc.)
+    std::env::set_var("GTK_THEME", "Adwaita:dark");
+
     tauri::Builder::default()
         .invoke_handler(tauri::generate_handler![
             pty_spawn,
@@ -555,6 +566,7 @@ pub fn run() {
             project_agent_state_save,
             project_agent_state_load,
             cli_get_group,
+            pick_directory,
         ])
         .plugin(tauri_plugin_updater::Builder::new().build())
         .plugin(tauri_plugin_dialog::init())

v2/src/lib/components/Workspace/SettingsTab.svelte

@@ -16,7 +16,7 @@
   import { getSetting, setSetting } from '../../adapters/settings-bridge';
   import { getCurrentTheme, setTheme } from '../../stores/theme.svelte';
   import { THEME_LIST, getPalette, type ThemeId } from '../../styles/themes';
-  import { open as openDialog } from '@tauri-apps/plugin-dialog';
+  import { invoke } from '@tauri-apps/api/core';
 
   let activeGroupId = $derived(getActiveGroupId());
   let activeGroup = $derived(getActiveGroup());
@@ -178,8 +178,8 @@
   }
 
   async function browseDirectory(): Promise<string | null> {
-    const selected = await openDialog({ directory: true, multiple: false });
-    return typeof selected === 'string' ? selected : null;
+    const selected = await invoke<string | null>('pick_directory');
+    return selected ?? null;
   }
 
   // New project form